Machine Heart

May 6, 2026 · Artificial Intelligence

PromptEcho: Leveraging Frozen Multimodal Models for High‑Quality Text‑to‑Image Rewards Without Labels

PromptEcho computes a continuous reward for text‑to‑image generation by measuring how well a frozen vision‑language model can reconstruct the original prompt from the generated image, eliminating the need for annotated data or a trained reward model and outperforming prior methods across multiple benchmarks.